Renaming a file / folder inside a zip file in Java?

Question

I have a zip file containing a folder structure like

• Main folder /
  • subFolder1 /
  • subFolder2 /
  • subFolder3 /
    • file3.1
    • file3.2

I would like to rename the folder main-folderto say versionXYinside this very zip file using Java.

Is there an easier way than extracting the whole zip file and re-creating the new one using the new folder names?

Answer 1

Zip is an archive format, so a mutation usually involves rewriting a file.

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Answer 2

, Java, , .NET.

DotNetZip - .NET zip , . Tom Hawtin, zip , , , zip-, , , " ". , , .

DotNetZip :

 var regex = new Regex("/OldDirName/.*$");
 int renameCount= 0;
 using (ZipFile zip = ZipFile.Read(ExistingZipFile))
 {
    foreach (ZipEntry e in zip)
    {
        if (regex.IsMatch(e.FileName))
        {
            // rename here
            e.FileName = e.FileName.Replace("/OldDirName/", "/NewDirName/");
            renameCount++;
        }
    }
    if (renameCount > 0)
    {
        zip.Comment = String.Format("This archive has been modified. {0} entries have been renamed.", renameCount);
        // any changes to the entries are made permanent by Save()
        zip.Save();  // could also save to a new zip file here
    }
 }

use.

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Answer 3

I think you can find help for this task using Commons Compress , especially ZipArchiveEntry

Answer 4

It does the trick. It flashes quickly because it only works in the central directory, not in files.

//  rezip( zipfile, "/main-folder", "/versionXY" );

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;


protected void rezip( String zipfile, String olddir, String newdir ) {

    Path zipFilePath = Paths.get( zipfile );
    try (FileSystem fs = FileSystems.newFileSystem( zipFilePath, null )) {
        Path oldpathInsideZipPath = fs.getPath( olddir );
        if( ! Files.exists( Paths.get( newdir ) ) )
            Files.createDirectory( Paths.get( newdir ) );

        if ( Files.exists( oldpathInsideZipPath, LinkOption.NOFOLLOW_LINKS ) ) {
            Files.walkFileTree(oldpathInsideZipPath, new SimpleFileVisitor<Path>() {
                 @Override
                 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                     throws IOException
                 {
                     if( file.toString().indexOf( olddir ) > -1 ){
                         String a = file.toString().replaceAll( olddir, newdir );
                         Path b = fs.getPath( a );
                         if( ! Files.exists( b.getParent() ) ){
                             Files.createDirectories( b.getParent() );
                         }
                         Files.move( file, b, LinkOption.NOFOLLOW_LINKS );
                     }
                     return FileVisitResult.CONTINUE;
                 }
                 @Override
                 public FileVisitResult postVisitDirectory(Path dir, IOException e)
                     throws IOException
                 {
                     if (e == null) {
                         Files.delete(dir);
                         return FileVisitResult.CONTINUE;
                     } else {
                         // directory iteration failed
                         throw e;
                     }
                 }
             });
        }
        fs.close();
    } catch ( Exception e ) {
        e.printStackTrace();
    }
}